# Eye Floaters and Flashes: What Is Normal and What Needs Urgent Attention URL: https://mohamedmohyudin.co.uk/eye-health/eye-floaters-flashes-warning-signs/ Last updated: 2026-09-08 Original clinical review: 2026-08-13; later editorial additions are source-based. ## Quick answer Most eye floaters are a normal part of ageing and are harmless, caused by the vitreous gel collapsing and casting shadows on the retina. However, a sudden shower of new floaters, flashes of light, or a dark shadow or curtain over your vision can signal a retinal tear or detachment and needs same-day ophthalmological assessment. ## Key facts - Floaters are common and usually a normal part of ageing - Posterior vitreous detachment affects most people over 60 - New floaters with flashes can signal a retinal tear - A shadow or curtain over vision is an emergency - West Yorkshire eye casualty is at Huddersfield Royal Infirmary - Retinal tears treated by laser retinopexy, around 15 minutes ## Introduction Floaters — the dots, threads, cobwebs or shadows that drift across your visual field — are extremely common. For most people, they are a normal part of ageing. But a sudden increase in floaters, or floaters accompanied by flashes of light, can occasionally be the first sign of a retinal tear or retinal detachment: conditions that require urgent treatment to preserve sight. ## What causes floaters? The eye is filled with a gel called vitreous humour. As we age, the vitreous gradually liquefies and collapses, often pulling away from the back of the eye in a process called posterior vitreous detachment (PVD). As the vitreous moves, tiny clumps of collagen cast shadows on the retina — these are what you see as floaters. PVD is extremely common, affecting most people over the age of 60, and is usually harmless. The floaters often become less noticeable over weeks to months as the brain adapts. ## When floaters and flashes are a warning sign As the vitreous peels away from the retina, it occasionally pulls hard enough to tear the retinal tissue. A retinal tear allows fluid to pass underneath the retina, which can lead to retinal detachment — a medical emergency requiring surgery. - A sudden shower of new floaters (particularly if they look like 'smoke' or a cloud of dots) — may indicate bleeding from a torn retinal vessel. - Flashes of light — caused by the vitreous tugging on the retina. Often described as lightning streaks or a flickering in peripheral vision. - A dark shadow, curtain, or veil over part of your vision — this is a retinal detachment until proven otherwise. - A sudden reduction in central vision — can indicate involvement of the macula. ## What to do if you get sudden new floaters or flashes Do not wait. Same-day dilated fundus examination by an ophthalmologist or optometrist with retinal imaging is required. If you develop a visual shadow or curtain, go directly to your nearest eye casualty — do not drive yourself. In West Yorkshire, the eye casualty is at Huddersfield Royal Infirmary. Alternatively, go to your nearest A&E and ask for an urgent ophthalmology review. ## Treatment of retinal tears If caught at the tear stage (before detachment), treatment is laser retinopexy — a quick outpatient laser procedure that welds the retina around the tear, sealing it. This procedure typically takes around 15 minutes and is very effective. Once retinal detachment has occurred, surgery is needed — either vitrectomy or scleral buckling — and the visual outcome depends heavily on whether the central part of the retina (the macula) was involved before surgery. ## Long-standing floaters with no other symptoms If you have had the same floaters for months or years with no change, no flashes, and no shadow over your vision, they are very likely benign. They rarely disappear entirely but most people find them less bothersome over time. Vitrectomy surgery to remove floaters is available privately but is reserved for cases where floaters cause significant, ongoing visual disability, given the small but real surgical risks involved. ## Who should skip a routine clinic and go to eye casualty? Go the same day if floaters arrived as a cloud of soot, if flashes are new, or if a dark curtain is moving across the field. Do not drive yourself if the field is already eaten. In West Yorkshire the eye casualty is at Huddersfield Royal Infirmary (01484 342000). A private consultation next week is the wrong door for a possible retinal tear. ## What is posterior vitreous detachment, and why does it scare people? PVD is the gel peeling off the retina. Most people over 60 get it. It causes floaters and sometimes flashes. It is usually harmless once a dilated exam has shown the retina is intact. The scare is the minority in which the peel tears retina. High myopes and people who have had cataract or YAG laser sit in a slightly higher-risk group — still not a reason to panic, a reason to be examined. ## Should you pay for vitrectomy just to remove floaters? Only if floaters still disable reading or driving after the brain has had months to adapt, and after a vitreoretinal surgeon has listed the risks: retinal detachment, cataract in a phakic eye, infection. Mr Mohyudin does not sell floater-only vitrectomy. If your exam is reassuring and the floaters are old, the honest advice is often reassurance plus time. ## Why can a second examination be needed after a reassuring retinal check? A retinal examination answers what can be seen at that point in time. Ask whether the whole relevant retina could be assessed, whether a repeat check is planned and what symptoms require you to return sooner. New floaters or flashes, an increase in their number, sudden blurring or a curtain-like shadow need urgent advice even if an earlier visit was reassuring. Keep the discharge instructions somewhere easy to find. For longstanding symptoms, explain their practical effect rather than only their number: reading a screen, bright outdoor conditions or tasks requiring fine detail. Separate that discussion from the assessment of new symptoms. An elective discussion about bothersome floaters should include what observation involves and the risks of any proposed intervention. Cataract surgery, a routine sight test or buying new glasses is not a substitute for assessing sudden retinal warning symptoms. ## Questions to take to your appointment - Was the retina fully assessed, and is follow-up needed? - Which changes mean I should return urgently? - Who should I contact outside normal clinic hours? ## Sources - [NHS: floaters and flashes](https://www.nhs.uk/symptoms/floaters-and-flashes-in-the-eyes/) ## FAQs ### I suddenly have a lot more floaters than usual. Should I go to A&E? A sudden increase in floaters — especially if accompanied by flashes of light, a shower of dark spots, or any shadow in your peripheral vision — warrants same-day ophthalmological assessment. Do not wait overnight. If your vision is also affected or you see a shadow/curtain, go to eye casualty or A&E immediately. ### Can floaters be treated or removed? Most floaters do not require treatment and become less noticeable over time. For significant, vision-disrupting floaters in an otherwise healthy eye, pars plana vitrectomy can remove them. This is effective but carries small risks (retinal detachment, cataract, infection) so is only recommended when floaters cause meaningful daily visual impairment. ### Are flashes of light in my vision always serious? Not always. Flashes caused by vitreous traction on the retina during a posterior vitreous detachment are very common and usually harmless — but they do require a dilated eye examination to confirm the retina is intact. Flashes associated with migraine (a spreading, shimmering arc that lasts 20–30 minutes, usually without a shadow or floaters) are a different phenomenon and generally harmless. ### I had cataract surgery last month and now I see floaters. Is that normal? New awareness of old floaters is common after a clearer lens. A sudden shower or flashes is not ‘normal adaptation’ — that still needs a dilated retina check. Mention the recent surgery when you attend. ### Can an optician rule out a retinal tear? Many optometrists can dilate and image the retina and will refer the same day if they see a tear or cannot get a view. If they cannot see the periphery clearly, you still need an ophthalmologist or eye casualty — a normal pressure reading is not a retina exam.